Mark J. Estienne

Learn More
Leptin concentrations in the circulation and milk were determined in sows that differed in body condition at farrowing, and in feed consumption during lactation. Serum concentrations of leptin at farrowing and weaning were highest in sows exhibiting the greatest amount of backfat. Leptin was detected in both skim and whole milk throughout lactation, but(More)
Semen characteristics in boars fed organic or inorganic sources of Se were assessed in 3 experiments. Crossbred boars were randomly assigned at weaning to 1 of 3 dietary treatments: I) basal diets with no supplemental Se (control), II) basal diets with 0.3 mg/kg of supplemental Se from an organic source (Sel-Plex, Alltech Inc., Nicholasville, KY), and III)(More)
The objective was to compare growth and physiological responses in boars fed diets supplemented with organic or inorganic sources of Se. At weaning, crossbred boars (n = 117; 8.3 kg of BW) were placed in nursery pens (3 boars/pen) and assigned within BW blocks to receive on an ad libitum basis 1 of 3 dietary treatments: I) basal diets with no supplemental(More)
Although numerous extenders exist for diluting boar semen, little research has been conducted comparing commercial extenders with regard to maintaining sperm motility during storage. The objective was to use a computer- assisted sperm analysis system to assess motility of boar spermatozoa diluted in Beltsville Thawing Solution, Merck-III, Androhep-lite,(More)
Seven sows were placed into one of two environmental chambers at 22 C, 5 d prior to farrowing. On day 9 of lactation, one chamber was changed to 30 C (n = 4) and the other remained at 22 C (n = 3). On days 24 and 25, blood samples were collected every 15 min for 9 hr and 7 hr, respectively. On day 24, thyrotropin releasing hormone (TRH) and gonadotropin(More)
The objective was to determine the effects of PGF2alpha on the training of sexually active boars (i.e., boars experienced with natural mating) to mount an artificial sow for semen collection. Boars were moved to a semen collection pen twice weekly for 4 wk. After entering the pen, boars received im treatment with 10 mg PGF2alpha (n = 7) or 2 mL deionized(More)
The objective of this study was to determine the effects of addition of spray-dried plasma protein (SDPP) and Cu to nonmedicated diets on growth performance and intestinal morphology in weaned pigs reared in sanitary or nonsanitary environments. Weanling pigs (n = 192, 18 +/- 2 d of age, 6.0 +/- 0.2 kg of BW) were assigned to 8 treatments arranged(More)
The objective was to determine the effects of repeated injections of PGF2alpha (Lutalyse; Pfizer) on semen and libido characteristics in terminal-line boars. Semen was collected once weekly from wk 0 to 15 and on four consecutive days during wk 16. Boars received an i.m. injection of 10 mg of PGF2alpha (n = 11) or 2 mL of vehicle (n = 11) immediately before(More)
The main objective of this study was to determine the effects of dietary supplementation with omega-3 polyunsaturated fatty acids on ovulation rate and litter size at day 27 post-mating in gilts. Estrous cycles were synchronized in crossbred gilts (n=48) using a progestin (Matrix; Intervet America Inc., Millsboro, DE, USA), fed at a rate of 15 mg/day for 18(More)
The study was conducted to determine effects of dietary supplementation with a blend of antioxidants (ethoxyquin and propyl gallate) on carcass characteristics, meat quality, and fatty acid profile in finishing pigs fed a diet high in oxidants. A total of 100 crossbred barrows (10.9±1.4 kg BW, 36±2 d of age) were randomly allotted to 5 diet treatments (5(More)